Process of manufacture of solid sulfites or bisulfites of homogenous chemical constitution.



. trated in our patent application Ser.

UNITED STATES PATENT OFFICE.

Brennan FRIEDRICH, F chose, NEAR cnnmm'rz, GERMANY, AND rnrnnmon HIRSGH, or IENNA, AUSTRIA-HUNGARY.

PROCESS OF MANUFACTURE- OF SOLID SULFITES OR BISULFITES OF HOMOGENEOUS CHEMICAL CONSTITUTION.

Specification of Letters Eatent.

Patented Mar. 24;, 1914.

N0 Drawing. Original application filed October 31, 1910, Serial No. 589,999. Divided and this applciation filed Kovember 14, 1913. Serial No. 801,089. V

Taall whom it'may concern:

Be it known that we, RICHARD FRIEDRICH, Ph. .D., chemist, and FRIEDRICH Hmso'n, Ph. 1).. chemist, subjects, respectively, of the King of Prussia and the Emperor of Aujs tria-Hungary, residing, respectively, at Gliisa, near Chemnitz, Germany, and

tion "from raw materials which are capable 01 forming 'sulfites by the action of sulful'HHS acid. In said process the raw material in a crushed state and containing a predetel-mined quantity of water according to the sulfite to he produced is moved in one direction, and a current of sulfurous acid gas is caused to flow in. an opposite direction and meet the raw material.- The quan tity of water is so calculated, that the heat of the reaction will evaporate only a part of the water. The sulfites and bisulfites produced. in such a manner are especially suitahlc for use in the production of other chemi 'al. compounds, because they are readily soluble in water; they are however not slahlc for a longer time. V

T he purpose or the present invention is to remove this latter disadvantage.

According to this invention the quantity of the water incorporated in the raw ma terial is so calculated that the heat of reaction will evaporate all the water, so that the product oi dryness.

Praterstrasse 33, Vieiina, Ill, Austria-Hungary,-

our patent application Semade from neutral sodium sulfite according to our invention as follows: The neutral sodium sulfite used as starting material had thefollowing composition:

The sulfite was cont nuously fed through the conical drum PIUCILlQCl with longitudinal ribs toits narrow end, While the sulfu- This percentage in the p Wdered material is the percentage of the best kinds of salable sodium pyrosulfite. The average of the tests obtained was. however, analyzed and gave the following results:

Found.

61.48% total S0 30.88% hound SO: 210.60% scrnlholind S0 Calculated. (31.20% SO;- -'0.7 M1 0, 00.98% Na "02sec, so 0.27% Na:(),0.55% Nngsone 113% duced in such manner can be preserved for j capable ot forming sulhtes by the action of an indefinite time without decomposin".

The apparatus used for carrying this process into practice is the same as illusln order to explain how the process may he carried inio przwtice the l'olh'iwing cx- What we claim is:

A process for the ii'iaiiul'acture of solid sulfitcs or bisulfitcs of homogeneous chemical constitution from raw materials which are suli'urous acid which consists in continuously imparting an advance movement in one direction to'the raw i'uatcrial containing a predetermined quantity of incorpo-' .raled. water therewith in a solid. crushed amples will serve: Sodium pyrosulfite is had the following percentage of sulfnrous acid gas flowing in the opposite direction to 3 meet the rawmaterial, the quantity of water used being so calculated that the heat of the reaction will evaporate all the Water so that 5 the finished product will exhibit the required degree of dryness, the velocity with IIANS Mioim.

which the raw material and the sulfurous In testimony whereof I afiix my signature acid gas are brought into mutual contact 5 in presence of two Witnesses. also being regulated so that the finished Du. FRIEDRICH l'llRSC/ll. '10 product will also exhibit the desired content lvitiiesses:

of sulfurous acid. AUoUs'r Fuoonn,

In testimony whereof I have hereunto set Aim Muuox Blfllitili.

my hand in presence of two subscribing wit nesses. Dn. RICHARD FRIEDRICH.

Witnesses I E. KILBOURNE Foo'rn, 

